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Search and Replace in whole database? (IPB)

I have no idea how to write SQL queries, that is why I am asking for help here. A user at one of my IPB forums wanted his account deleted but the problem is the quoted posts are not deleted with the accounts. So I need a query to replace his username with some other random string. Can any SQL guru cook something up? BTW the username is totally unique so it wouldn't affect any other fields.
Thanks